CN108385169B - A kind of optical crystal material technology of preparing equipment of special applications - Google Patents
A kind of optical crystal material technology of preparing equipment of special applications Download PDFInfo
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- CN108385169B CN108385169B CN201810392972.8A CN201810392972A CN108385169B CN 108385169 B CN108385169 B CN 108385169B CN 201810392972 A CN201810392972 A CN 201810392972A CN 108385169 B CN108385169 B CN 108385169B
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B35/00—Apparatus not otherwise provided for, specially adapted for the growth, production or after-treatment of single crystals or of a homogeneous polycrystalline material with defined structure
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- Crystallography & Structural Chemistry (AREA)
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- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
The invention discloses a kind of optical crystal material technology of preparing equipment, including fixed bottom plate, a seal case is provided on the left of the fixed bottom plate upper surface, the seal case is internally provided with a sealing space, the middle position that seal case upper surface described in a heating device is fixedly installed on front side of the sealing space lower end wall is connected with an air inlet pipe, a cooling bath is distributed in winding at end wall inside the sealing space, a cooling tube is distributed with inside the cooling bath, the middle position of sealing space left end wall is embedded to be equipped with a temperature inductor, a grinding device is provided on the right side of the fixed bottom plate upper surface.In present invention work, the temperature in intelligent control sealing space meets the requirement of temperature change in reaction process, improves the quality of production, and after the reaction was completed, Continuous maching, the temperature and nitrogen reduced in sealing space leaks, and economizes on resources, and reduces processing cost.
Description
Technical field
The present invention relates to crystal preparation field, the optical crystal material technology of preparing equipment of specially a kind of special applications.
Background technique
Optical crystal is used as the crystalline material of optical medium material, be mainly used for making ultraviolet and infrared region window,
Lens and prism are divided into monocrystalline and polycrystalline by crystal structure, since monocrystal material has high crystal perfection and light transmission rate,
And low input loss, therefore common optical crystal, based on monocrystalline, laser is as a kind of high-intensitive, good directionality phase
Dry monochromatic source is widely used in the fields such as scientific research, industry, traffic, national defence and health care, however current various laser
The laser wavelength that device directly exports is limited, laser blank wave band is still had from ultraviolet band to infrared band, so using non-thread
Property optical crystal carry out frequency conversion and obtained the technology of various laser light sources is suitble to have become extremely urgent problem.
Summary of the invention
It is above-mentioned to solve the purpose of the present invention is to provide a kind of optical crystal material technology of preparing equipment of special applications
The problem of being proposed in background technique.
To achieve the above object, the invention provides the following technical scheme: prepared by a kind of optical crystal material of special applications
Technical equipment, including fixed bottom plate, are provided with a seal case on the left of the fixed bottom plate upper surface, in the seal case
Portion is provided with a sealing space, and a heating device, the sealing space are fixedly installed on front side of the sealing space lower end wall
Internal rear side is provided with a lifter plate, the left and right sides inside the lifter plate be respectively arranged with perforative threaded hole up and down and
Sliding eye is respectively arranged with a threaded rod and a sliding bar, the upper and lower ends of the sliding bar in the threaded hole and sliding eye
It is fixedly connected respectively with the upper and lower ends wall of sealing space, inside the sealing space upper surface at position corresponding with threaded rod
Be fixedly installed a lifting motor, upper end and the lifting motor of the threaded rod are connected by power, the lower end of the threaded rod with it is close
The lower end wall rotary type in envelope space is fixedly connected, and a drive block, the drive are fixedly connected on the left of the lifter plate front end face
It is internally provided with a driving space on front side of motion block, the driving space interior is fixedly installed a driving motor, the driving
Motor right end has been connected by power a drive shaft, and the right end of the drive shaft passes through the right end wall in driving space and is fixedly connected with one
Drive sleeve, the drive sleeve are internally provided with an internal screw thread space, and the internal screw thread space interior, which is threadedly engaged, to be connected with
One screw telescopic plate, the center position of screw telescopic plate right side are fixedly connected with a splined shaft, the splined shaft
Right end passes through the right end wall in internal screw thread space and is fixedly connected with the piston plate of a vertical direction, the right side of the lifter plate front end face
Side is fixedly connected with a quartz ampoule by concave block, and the quartz ampoule is internally provided with the reaction compartment of opening to the right, the work
Seben is located at the left side inside reaction compartment and sealing cooperation, and the middle position of reaction compartment left end wall is provided with a left side
The splined hole of right perforation, the splined hole and splined shaft are cooperatively connected, and the sealing space right end pars intramuralis is corresponding with quartz ampoule
Position at be provided with a compression space, the compression space is internally provided with the limit plate of a vertical direction, the limit plate
Right end is fixedly connected with a compressed spring, and the right end of the compressed spring is fixedly connected with the right end wall of compression space, the limit
Be fixedly connected with a convex block at the center of position plate left side, the left end of the convex block pass through the left end wall of compression space and with
Quartz ampoule clearance fit is fixedly installed an air pressure at position corresponding with compression space on the upside of the sealing space right side
Pump, the middle position of the limit plate right side are connected with a snorkel, the snorkel connection reaction compartment and pulsometer,
The snorkel is internally provided with a solenoid valve, and the middle position of the quartz ampoule upper surface is provided with a feed opening, described
Feed opening is internally provided with a sealing valve, and the sealing space upper end wall is provided with a charging at position corresponding with feed opening
Pipe, the lower end of the feed pipe are located in feed opening, and the upper end of the feed pipe is provided with a hopper, the seal case upper end
The middle position in face is connected with an air inlet pipe, air inlet pipe communication seals space, is provided with one on the air inlet pipe tube body
Air pressure valve, a cooling bath is distributed in winding at end wall inside the sealing space, and a cooling tube is distributed with inside the cooling bath,
The upper end of the cooling tube passes through the upside of sealing space left end wall and is fixedly connected with an inlet valve, the lower end of the cooling tube
Across sealing space left end wall downside and be fixedly connected with a drain valve, in the middle position of sealing space left end wall
Embedded is equipped with a temperature inductor, is provided with a connecting tube on the downside of the sealing space right end wall, on the fixed bottom plate
A grinding device, connecting tube communication seals space and grinding device are provided on the right side of end face.
Preferably, the electrically connected heating device of the temperature inductor, water inlet valve and a drain valve.
Preferably, the lower end of the feed pipe is located at the inside of feed opening, and the outer end face of the feed pipe and blanking
The inner end wall clearance fit of mouth.
Preferably, the diameter of the convex block is equal to the diameter of quartz ampoule, and the interposition of the convex block left side
Set the smooth protrusion in place.
Preferably, the length in the internal screw thread space is equal to the length of reaction compartment, the diameter of the connecting tube is equal to
The diameter of quartz ampoule, and the left end of the connecting tube extends to the left, the length of the extending part are equal to quartz ampoule right end to close
Seal the distance of space right end wall.
Compared with prior art, the beneficial effects of the present invention are: lifter plate is located at highest point position in present invention work,
Feed pipe is connected to reaction compartment, and sealing valve is opened, and is packed into reaction compartment by the raw material that hopper prepares optical crystal, together
When, air inlet pipe connects source nitrogen, opens air pressure valve, makes to be packed into nitrogen in sealing space, the oxidation of raw material, work when reducing charging
In work, sealing valve is closed, and pushes limit plate to move to the left by compressed spring, to guarantee that convex block is closely pasted with quartz ampoule
It closes, it is ensured that the leakproofness inside reaction compartment, air pressure pump work are guaranteed anti-by the air in snorkel abstraction reaction space
Vacuum state required for during answering, the electrically connected heating device of temperature inductor, water inlet valve and a drain valve, so that intelligence is adjusted
The temperature in sealing space is controlled, the requirement of temperature change in reaction process is met, improves the quality of production, after the reaction was completed, lifting
Motor work drives lifter plate decline by threaded rod, and during decline, quartz ampoule also declines therewith, and convex block is squeezing
Effect move right, compressed spring is shunk, to guarantee the normal operation of device, when lifter plate is located at lower end, quartz ampoule
It is fitted closely with connecting tube, driving motor work, drive sleeve rotation is driven by drive shaft, and splined shaft and splined hole cooperate
The rotation of screw telescopic plate is limited, so that the cooperation by internal screw thread space and screw telescopic plate drives screw telescopic plate to the right
Side is mobile, is moved right by piston plate, the bulk crystals in driving a reaction space enter grinding device by connecting tube, continuously
Processing, the temperature and nitrogen reduced in sealing space leak, economize on resources, and reduce processing cost.
Detailed description of the invention
Fig. 1 is that a kind of front view structure of the optical crystal material technology of preparing equipment entirety complete section of special applications of the present invention is shown
It is intended to；
Fig. 2 is that a kind of left view structure of the optical crystal material technology of preparing equipment entirety complete section of special applications of the present invention is shown
It is intended to；
Fig. 3 is that a kind of plan structure of the optical crystal material technology of preparing equipment entirety complete section of special applications of the present invention is shown
It is intended to.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-3 is please referred to, a kind of embodiment provided by the invention: a kind of optical crystal material technology of preparing of special applications
Equipment, including fixed bottom plate 1, are provided with a seal case 2 on the left of fixed 1 upper surface of bottom plate, in the seal case 2
Portion is provided with a sealing space 3, is fixedly installed a heating device 10, the sealing on front side of 3 lower end wall of sealing space
Rear side inside space 3 is provided with a lifter plate 4, and the left and right sides inside the lifter plate 4 is respectively arranged with perforative up and down
Threaded hole 5 and sliding eye 6 are respectively arranged with a threaded rod 7 and a sliding bar 8, the cunning in the threaded hole 5 and sliding eye 6
The upper and lower ends of lever 8 are fixedly connected with the upper and lower ends wall of sealing space 3 respectively, inside 3 upper surface of sealing space with
A lifting motor 9 is fixedly installed at the corresponding position of threaded rod 7, the upper end of the threaded rod 7 and 9 power of lifting motor connect
It connects, the lower end of the threaded rod 7 is fixedly connected with the lower end wall rotary type of sealing space 3, the left side of 4 front end face of lifter plate
It is fixedly connected with a drive block 11,11 front side of drive block is internally provided with a driving space 12, the driving space 12
Inside is fixedly installed a driving motor 13, and 13 right end of driving motor has been connected by power a drive shaft 14, the drive shaft
14 right end passes through the right end wall in driving space 12 and is fixedly connected with a drive sleeve 15, is arranged inside the drive sleeve 15
There is an internal screw thread space 16,16 internal whorl of internal screw thread space is connected with a screw telescopic plate 17, and the screw thread is stretched
The center position of 17 right side of contracting plate is fixedly connected with a splined shaft 18, and the right end of the splined shaft 18 passes through internal screw thread space
16 right end wall and the piston plate 19 for being fixedly connected with a vertical direction pass through concave block on the right side of 4 front end face of the lifter plate
20 are fixedly connected with a quartz ampoule 21, and the quartz ampoule 21 is internally provided with the reaction compartment 22 of opening to the right, the piston plate
19 are located at the left side inside reaction compartment 22 and seal cooperation, and the middle position of the 22 left end wall of reaction compartment is provided with one
The splined hole 23 of left and right perforation, the splined hole 23 are cooperatively connected with splined shaft 18, the 3 right end pars intramuralis of sealing space and stone
English pipe 21 is provided with a compression space 24 at corresponding position, and the compression space 24 is internally provided with the limit of a vertical direction
Plate 25,25 right end of limit plate are fixedly connected with a compressed spring 26, the right end and compression space 24 of the compressed spring 26
Right end wall be fixedly connected, a convex block 27, the convex block 27 are fixedly connected at the center of 25 left side of limit plate
Left end pass through compression space 24 left end wall and with 21 clearance fit of quartz ampoule, on the upside of 3 right side of sealing space with pressure
A pulsometer 28 is fixedly installed at the corresponding position in contracting space 24, the middle position of 25 right side of limit plate is connected with
One snorkel 29, the snorkel 29 is connected to reaction compartment 22 and pulsometer 28, the snorkel 29 are internally provided with an electromagnetism
The middle position of valve 30,21 upper surface of quartz ampoule is provided with a feed opening 31, and it is close that the feed opening is internally provided with one
Valve 32 is sealed, 3 upper end wall of sealing space is provided with a feed pipe 33, the feed pipe 33 at position corresponding with feed opening 31
Lower end be located in feed opening 31, the upper end of the feed pipe 33 is provided with a hopper 34, in 2 upper surface of seal case
Between be connected with an air inlet pipe 35 at position, the 35 communication seals space 3 of air inlet pipe is provided with one on 35 tube body of air inlet pipe
Air pressure valve 36, a cooling bath 37 is distributed in winding at the 3 inside end wall of sealing space, is distributed with one inside the cooling bath 37
Cooling tube 38, the upper end of the cooling tube 38 pass through the upside of 3 left end wall of sealing space and are fixedly connected with an inlet valve 39, institute
The lower end for stating cooling tube 38 passes through the downside of 3 left end wall of sealing space and is fixedly connected with a drain valve 40, the sealing space 3
The middle position of left end wall is embedded to be equipped with a temperature inductor 41, is provided on the downside of the 3 right end wall of sealing space
One connecting tube 42, a grinding device 43 is provided on the right side of fixed 1 upper surface of bottom plate, and 42 communication seals of connecting tube are empty
Between 3 and grinding device 43.
Valuably, the electrically connected heating device 10 of the temperature inductor 41, inlet valve 39 and drain valve 40, thus intelligence
Regulate and control the temperature in sealing space 3, meet the requirement of temperature change in reaction process, improves the quality of production.
Valuably, the lower end of the feed pipe 33 is located at the inside of feed opening 31, and the outer end face of the feed pipe 33 with
The inner end wall clearance fit of feed opening 31.Its effect is, when lifter plate 4 is located at highest point position, the connection reaction of feed pipe 33 is empty
Between 22, sealing valve 32 open, convenient for by hopper 34 be reaction compartment 22 be packed into optical crystal preparation raw material.
Valuably, the diameter of the convex block 27 is equal to the diameter of quartz ampoule 21, and in 27 left side of the convex block
Between it is smoothly raised at position.Its effect is to push limit plate 25 to move to the left by compressed spring 26, to guarantee convex block
27 fit closely with quartz ampoule 21, it is ensured that the leakproofness inside reaction compartment 22.
Valuably, the length in the internal screw thread space 16 is equal to the length of reaction compartment 22, the diameter of the connecting tube 42
Left end equal to the diameter of quartz ampoule 21, and the connecting tube 42 extends to the left, and the length of the extending part is equal to quartz ampoule
Distance of 21 right ends to 3 right end wall of sealing space.Its effect is, when lifter plate 4 is located at lower end, quartz ampoule 21 and connecting tube 42
It fitting closely, driving motor 13 works, and drive drive sleeve 15 to rotate by drive shaft 14, and splined shaft 18 is matched with splined hole 23
Conjunction limits the rotation of screw telescopic plate 17, to drive screw thread to stretch by internal screw thread space 16 and the cooperation of screw telescopic plate 17
Contracting plate 17 moves to the right, is moved right by piston plate 19, and the bulk crystals in driving a reaction space 22 pass through connecting tube 42
Into grinding device 43, Continuous maching, the temperature and nitrogen reduced in sealing space 3 leaks, and economizes on resources, reduction is processed into
This.
Specifically used mode: in present invention work, lifter plate 4 is located at highest point position, and feed pipe 33 is connected to reaction compartment
22, sealing valve 32 is opened, and is packed into reaction compartment 22 by the raw material that hopper 34 prepares optical crystal, meanwhile, air inlet pipe 35
Source nitrogen is connected, opening air pressure valve 36 makes to be packed into nitrogen in sealing space 3, the oxidation of raw material when reducing charging, in work,
Sealing valve 32 is closed, and pushes limit plate 25 to move to the left by compressed spring 26, to guarantee convex block 27 and quartz ampoule 21
It fits closely, it is ensured that the leakproofness inside reaction compartment 22, pulsometer 28 works, by 29 abstraction reaction space 22 of snorkel
Air, guarantee reaction process in required vacuum state, the electrically connected heating device 10 of temperature inductor 41, inlet valve 39
Life is improved so that the temperature in intelligent control sealing space 3, meets the requirement of temperature change in reaction process with drain valve 40
Yield and quality, after the reaction was completed, lifting motor 9 work, and drive lifter plate 4 to decline by threaded rod 7, during decline, quartz
Pipe 21 also declines therewith, and convex block 27 moves right in the effect of extruding, and compressed spring 26 is shunk, to guarantee the normal of device
Operation, when lifter plate 4 is located at lower end, quartz ampoule 21 is fitted closely with connecting tube 42, and driving motor 13 works, and passes through drive shaft
14 drive drive sleeve 15 to rotate, and splined shaft 18 and the cooperation of splined hole 23 limit the rotation of screw telescopic plate 17, thus logical
It crosses internal screw thread space 16 and the cooperation of screw telescopic plate 17 drives screw telescopic plate 17 to move to the right, to the right by piston plate 19
Mobile, the bulk crystals in driving a reaction space 22 enter grinding device 43 by connecting tube 42, and it is empty to reduce sealing for Continuous maching
Between temperature in 3 and nitrogen leak, economize on resources, reduce processing cost.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
Claims (4)
1. a kind of optical crystal material technology of preparing equipment, including fixed bottom plate, it is characterised in that: the fixed bottom plate upper surface
Left side be provided with a seal case, the seal case is internally provided with a sealing space, the sealing space lower end wall
Front side is fixedly installed a heating device, and the rear side inside the sealing space is provided with a lifter plate, inside the lifter plate
The left and right sides be respectively arranged with perforative threaded hole and sliding eye up and down, be respectively arranged with one in the threaded hole and sliding eye
Threaded rod and a sliding bar, the upper and lower ends of the sliding bar are fixedly connected with the upper and lower ends wall of sealing space respectively, described
Be fixedly installed a lifting motor inside sealing space upper surface at position corresponding with threaded rod, the upper end of the threaded rod and
Lifting motor is connected by power, and the lower end of the threaded rod is fixedly connected with the lower end wall rotary type of sealing space, the lifter plate
It is fixedly connected with a drive block on the left of front end face, is internally provided with a driving space, the driving on front side of the drive block
Space interior is fixedly installed a driving motor, and the driving motor right end has been connected by power a drive shaft, the drive shaft
Right end passes through the right end wall in driving space and is fixedly connected with a drive sleeve, and the drive sleeve is internally provided with an internal screw thread
Space, the internal screw thread space interior, which is threadedly engaged, is connected with a screw telescopic plate, the center of screw telescopic plate right side
A splined shaft is fixedly connected at position, the right end of the splined shaft passes through the right end wall in internal screw thread space and is fixedly connected with one
The right side of the piston plate of vertical direction, the lifter plate front end face is fixedly connected with a quartz ampoule, the quartz by concave block
Pipe is internally provided with the reaction compartment of opening to the right, and the piston plate is located at the left side inside reaction compartment and sealing cooperation, institute
The middle position for stating reaction compartment left end wall is provided with the splined hole of one or so perforation, and the splined hole and splined shaft cooperation connect
It connects, is provided with a compression space at sealing space right end pars intramuralis position corresponding with quartz ampoule, in the compression space
Portion is provided with the limit plate of a vertical direction, and the limit plate right end is fixedly connected with a compressed spring, the compressed spring
Right end is fixedly connected with the right end wall of compression space, and a convex block, institute are fixedly connected at the center of the limit plate left side
State convex block left end pass through compression space left end wall and with quartz ampoule clearance fit, on the upside of the sealing space right side with
A pulsometer is fixedly installed at the corresponding position of compression space, it is logical that the middle position of the limit plate right side is connected with one
Tracheae, snorkel connection reaction compartment and pulsometer, the snorkel are internally provided with a solenoid valve, on the quartz ampoule
The middle position of end face is provided with a feed opening, and the feed opening is internally provided with a sealing valve, the sealing space upper end
A feed pipe is provided at wall position corresponding with feed opening, the lower end of the feed pipe is located in feed opening, the feed pipe
Upper end be provided with a hopper, the middle position of the seal case upper surface is connected with an air inlet pipe, and the air inlet pipe connects
Lead to sealing space, an air pressure valve is provided on the air inlet pipe tube body, winding is distributed with one at end wall inside the sealing space
Cooling bath, a cooling tube is distributed with inside the cooling bath, and the upper end of the cooling tube passes through the upside of sealing space left end wall
And it is fixedly connected with an inlet valve, the lower end of the cooling tube passes through the downside of sealing space left end wall and is fixedly connected with a row
Water valve, the middle position of sealing space left end wall is embedded to be equipped with a temperature inductor, the sealing space right end
It is provided with a connecting tube on the downside of wall, a grinding device is provided on the right side of the fixed bottom plate upper surface, the connecting tube connects
Logical sealing space and grinding device.
2. a kind of optical crystal material technology of preparing equipment according to claim 1, it is characterised in that: the temperature sense
The electrically connected heating device of device, water inlet valve and a drain valve.
3. a kind of optical crystal material technology of preparing equipment according to claim 1, it is characterised in that: the feed pipe
Lower end is located at the inside of feed opening, and the inner end wall clearance fit of the outer end face of the feed pipe and feed opening.
4. a kind of optical crystal material technology of preparing equipment according to claim 1, it is characterised in that: the convex block
Diameter is equal to the diameter of quartz ampoule, and the middle position of the convex block left side is smoothly raised.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810392972.8A CN108385169B (en) | 2018-04-27 | 2018-04-27 | A kind of optical crystal material technology of preparing equipment of special applications |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810392972.8A CN108385169B (en) | 2018-04-27 | 2018-04-27 | A kind of optical crystal material technology of preparing equipment of special applications |
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| CN108385169A CN108385169A (en) | 2018-08-10 |
| CN108385169B true CN108385169B (en) | 2019-01-11 |
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| CN1873060A (en) * | 2005-05-17 | 2006-12-06 | 日立电线株式会社 | Compound semiconductor single crystal, vessel for growing the same, and process for fabricating the same |
| CN101503819B (en) * | 2008-02-04 | 2012-12-12 | 中国科学院理化技术研究所 | Method and device for growing large-size nonlinear optical crystal by crucible and seed crystal linkage |
| CN103668455B (en) * | 2012-09-14 | 2016-08-03 | 中国科学院理化技术研究所 | LBO crystal growth device and growth method |
| US20160230307A1 (en) * | 2015-02-05 | 2016-08-11 | Solarworld Industries America Inc. | Apparatus and methods for producing silicon-ingots |
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Effective date of registration: 20181128 Address after: 226661 No. 190 Shuanglou Road, Qutang Town, Haian City, Nantong City, Jiangsu Province Applicant after: Nantong Xiangyang Optical Element Co., Ltd. Address before: 301700 Tianjin Dongli Free Trade Test Zone (Tianjin Port Free Trade Zone) No. 129 Haibin No. 10 Road, Science and Technology No. 2 Applicant before: Yi Fu optical (Tianjin) Electronic Technology Co. Ltd. |
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